Effect of temperature on dicyandiamide (DCD) longevity in pastoral soils under field conditions

•Dicyandiamide (DCD) degradation rate and mean soil temperature were linearly related.•At 8 and 16°C, estimated DCD half-lives were 39±6 and 25±3 days, respectively.•At a temperature, DCD degraded faster in soils in the field than in incubated samples. Data were analysed from five trials begun in au...

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Veröffentlicht in:Agriculture, ecosystems & environment ecosystems & environment, 2014-03, Vol.186, p.201-204
Hauptverfasser: Kelliher, F.M., van Koten, C., Kear, M.J., Sprosen, M.S., Ledgard, S.F., de Klein, C.A.M., Letica, S.A., Luo, J., Rys, G.
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Sprache:eng
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Zusammenfassung:•Dicyandiamide (DCD) degradation rate and mean soil temperature were linearly related.•At 8 and 16°C, estimated DCD half-lives were 39±6 and 25±3 days, respectively.•At a temperature, DCD degraded faster in soils in the field than in incubated samples. Data were analysed from five trials begun in autumn at a field site and a relationship between time for concentration of the nitrification inhibitor dicyandiamide (DCD) in soil to halve (t½, days) and the mean soil temperature (T, °C) was developed: t½=54–1.8T. For example, when T was 8 and 16°C, t½ was 39±6 and 25±3 days (±95% confidence limit), respectively. Previously, under laboratory conditions at equivalent temperatures, the corresponding values of t½ were 86±31 and 44±24days. Thus, the proportional responses of t½ to increasing T from 8 to 16°C were similar, but under field conditions t½ was about half that under laboratory conditions.
ISSN:0167-8809
1873-2305
DOI:10.1016/j.agee.2014.01.026